Income Taxes (Schedule Of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1:	$ 0.5	$ 1.0	$ 1.7
Reductions for tax positions of prior years	(0.1)	(0.5)	(0.7)
Balance at December 31:	$ 0.4	$ 0.5	$ 1.0